Black Soldier fly Frass ( Natural Fertilizer ) 1kg

BSFL Frass as Fertilizer:
Use of Insect Larvae Residuals as Soil
Amendment for Lawn and Garden, Fruit
and Vegetable, and Crop Production
Frass refers to the excrement of insects and
will often contain other components such as
exoskeleton sheds and food residue. The frass
of commercially-produced insect larvae,
including the black soldier fly (Hermetia
illucens, BSF) and mealworm (Tenebrio
molitor), have great potential as a fertilizer
with many applications, and are also a
sustainable source since commerciallyproduced insects are a way of utilizing preconsumer food by-products that may
otherwise create waste streams. Additionally,
the use of insect frass can reduce the need for
chemical fertilizers.
N-P-K1, 3
Nitrogen (N), phosphorous (P) and potassium
(K) are the three macronutrients used by
plants for 1) growth and development of
foliage (N), 2) growth and development of
roots (P), and 3) to aid plant overall function
(K). Insect larvae frass has been found to
contain nutrients in readily-available forms
compared to traditional fertilizers, and have
as high of N-P-K values as chicken manure.
This would indicate a consistent distribution
and slow release of minerals from frass into
the soil. Across BSFL frass lots from various
sources, average nutrient content (DMB) was
reported as 3.39% nitrogen (N), 2.85%
phosphorous (P2O5), and 3.47% potassium
Literature Findings1, 2, 3, 4
• Nitrogen mineralization in soil
containing mealworm frass was rapid for
the first 17 days after application to
barley plants (Hordeum vulgare), then
continued more slowly for the remainder
of the incubation period.
• Over 28 days of ryegrass (Lolium
perenne) growth, phosphorous
bioavailability was 10% higher with
BSFL frass compared to the control of a
standard ammonium nitrate (NH4NO3)
fertilizer. All treatments contained 40 mg
• No detectable Escherichia coli (E. coli)
or Salmonella spp. in soils with BSFL
frass compared to the
With shipment Delivery - for R 0,00
Sales price R 80,00
Price / kg:


2.5-2-2.5 Fertilizer (NPK)*

  • Mix with water for indoor and outdoor fertilizing
  • Can be applied dry via a spreader for large areas
  • Minimal odor!
  • Dry and ready to use

How to Use:

  • Watering: Mix 1/2 cup fertilizer per gallon of water, let stand for 10 mins, water. Repeat every 2 weeks
  • Potting: Add 1 cup fertilizer per gallon of potting soil
  • Garden: Spread 1 pound fertilizer to every 20 square feet of topsoil

In general:

Insect castings naturally contain the nutrition plants require, beneficial micro-organisms, and the only immediately plant-available source of chitin (pronounced “Kite-in”). Chitin fortifies a plant from the inside out, causing an “auto-immune” response that signals a plant to produce natural toxins which fend off its natural enemies like pests and fungal pathogens. The EPA says that chitin and chitosan defend against botrytis (grey mold), powdery mildew, early and late blight, fungal pathogens in the root zone (root rot) and root-feeding nematodes.


Insect Castings for Row Crops & Raised Beds:
Add up to 1Lb. of insect castings per 20 sq. feet
Gently dig in to top 6 inches of soil and water thoroughly
Lightly top dress 2 times a month with castings and water thoroughly

Pre-Mix for Soil or Potted Plants:
Mix up to 1 cup insect castings per cubic foot soil or potting medium
Top dress or root drench 2 times a month
Apply castings weekly
For best results use dechlorinated or filtered water

Full-Strength Insect Castings Tea Extract (root drench):
Add  1/2 cup of mealworm fertilizer with one gallon of dechlorinated water
Wait 10 minutes, then water
Feed monthly or as desired
Use within 2 hours of mixing or refrigerate for up to 1 week
Do not store at room temperature once mixed